Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Dependence of Damping Capacity on ${\beta}$ Phase Precipitation in Mg Alloy

Mg 합금에서 진동감쇠능의 ${\beta}$상 석출 의존성

  • Jun, Joong-Hwan (Light Material Team, Advanced Materials Division, Korea Institute of Industrial Technology)
  • 전중환 (한국생산기술연구원 신소재본부 경량소재팀)
  • Published : 2007.11.30
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Abstract

Changes in microstructure and damping capacity with aging time for solutionized Mg-Al alloy have been investigated. Discontinuous ${\beta}\;(Mg_{17}Al_{12})$ precipitates form along the primary grain boundaries, the amount of which increases as the aging time increases. The hardness of the matrix with respect to aging time shows a typical "S" shape, indicating a generation of fine continuous precipitates in the matrix during the aging. The peak level of damping capacity is obtained after 1 hour of aging, over which the damping capacity becomes deteriorated continuously. The formation of optimum density of continuous ${\beta}$ precipitates with fine morphology which would act as pinning points for dislocation lines, might be responsible for the improvement of damping capacity.

Keywords

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